Dust-collector.



. V. T. JOHNSON & c. G. ARVIDSON.

DUST COLLECTOR. APPLICATION rum) JULY 10,

Patented July 12,1910.

3 v n n u I ww WWW I f W .J ww M w wwffim G w 5 W VICTOR '1. JOHNSON ANDCARL G. ARVIDSON, OF MINNEAPOLIS, MINNESOTA DUST-COLLECTOR.

Specification of Letters Patent.

Patented July 12, 1910.

To all whom it may concern:

Be it known that we, Vro'ron T. JOHNSON and CARL G. ARvmsoN, VICTOR T.JOHNSON being a citizen of the United States and CARL G. ARvInsoN beinga subject. of the King of Sweden, both residing at Minneapolis, in thecounty of Hennepin and State of Minnesota, have invented certain new anduseful Improvements in Dust-Collectors; and we do hereby declarethefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

Our invention has for its object to provide a highly eflicient dustcollector of simple construction, and to this end, it consists of thenovel devices and combinations of devices hereinafter described anddefined in the claim.

' In the accompanying drawings which illustratethe improved dustcollector, like characters indicate like parts throughout the severalviews.

Referring to the drawings: Figure 1 is a vertical section taken throughthe improved .and downward, and is united therewith by an air-tightjoint. Preierably the air outlet tube 5 extends about half way downwardthrough the cylindrical portion 1 of the casing. The inlet'spout 6 forthe commingled air and dust, opens tangentially into the cylindricalshell section 1, through an opening 7 which is located above-the lowerend of the air outlet tube 5.

Rigidly secured to the lower end of the air outlet tube 5, is adepending conical deflector 8 which is formed with a multiplicity ofcircumferentially spaced air ports 9 and intervening deflecting plates10, which latter are preferably formed for slitting the deflector body 8and bending outward the partially severed portions to form the saidports 9and deflecting blades 10. The deflecting blades 10, it isimportant to note, extend approximately tangentially to the conicalsurface of the deflectorbody 8, and extend in the direction in which thecommingled air and dust are revolved when discharged from the spout 6into the casing of the dust collector, as shown by arrows marked on Fig.2.

To regulate the discharge of air out of the upper end of the air outlettube 5, a damper, preferably in the form of a conical head 11, islocated immediately over the upper end of said tube 5. Threaded guiderods 12 secured at their upper ends to the upper end of the outlet tube5, are passed through perforations in the rim of the head 11, and thelatter is adjustable on the said rods by cooperating nuts 13.

In the extreme lower end of the so-called deflector 8, is an axialopening 8*. The total conducting capacity of this opening 8 and of themultiplicity of ports 9, should equal the conducting capacity of the airoutlet tube 5.

The operation is substantially as follows: The air, dust, shavings orother material carried thereby will as is usual, be blown into the dustcollector through the spout 6, and entering the cylindrical portion 1 ofthe easing tangentially through the opening 7, will by centrifugalforce, be caused to whirl rapidly around within thesaid cylindricalportion 1, and while under this whirling motion, which throws theheavier particles outward into contact with the casing, the air will bedrawn ofi' through the ports 9 and outlet tube 5, while the dust orheavy particles will be precipitated into the hopper 2, and from thencedownward through the discharge spout 3. It is important to note that theair in passing upward and outward through the ports 9, must make anabrupt backward turn around the edges of the defleeting blades 10, sothat any dust or light particles still carried thereby will be p1.ecipitated at these ports.

The head 11 will require setting in diiferent positions under differentconditions. For instance, variations in the intensity of the blastof'the air blown into the casing, will require different adjustments ofthe said head in order to elfect proper separation of the air from thedust or other material carried by the air into the casing. When theblast is turned on and the dust laden air is driven into the casing, thesaid head should be adjusted to a position in which the air will passupward of the tube 5 without carryin any of the dust there-' with, andyet 1t s ould not be set so close to the upper end of the saidtube 5 asto give any unnecessary contraction in the air outlet passage. It willtherefore be seen that the adjustment of this head or damper so-called,is a highly important feature.

In actual practice, a very large dust col lector constructed asillustrated in the drawings, has been found highly efiicient-for thepurposes had in view.

What we claim is:

In a dust collector, the combination with an upright casing having acylindrical body portion and a depending ho per-like lower portionterminatmg in a epending discharge spout'and also having an inlet spoutopening tangentially into its cylindrical portion, of an air outlet tubeextending axially upward from the i erior of said casing and a dependingconic'zildeflector secured to the lower end of said air outlet tube,entirely below said tangential inlet passage and proof clrcumferenvidedwith a multiplicit tially spaced oblique de ectin blades and VICTOR 'r.JOHNSON. CARL G. ARVIDSON.

Witnesses ALICE V; SWANSON, HARRY D. KILGORE.

deflecting blades pro ect obliquely outward in the cir-

